I just recently learned that Logitech unifying receivers were susceptible to “mousejacking”[1] for years before a firmware update fixed it in 2016. There’s still probably many non-updated receivers out there.

[1] https://www.theverge.com/2019/7/14/20692471/logitech-mouseja...

To a mildly capable and somewhat determined attacker (who can get relatively close to you) this means your keyboard is probably readable from the radio signals.

A Physical keystroke logger if you want to think of it that way.